1. Building High-Density Polar Hybrid Perovskites via Intercalation of Cs + and Aromatic Diamine for Passive X-ray Detection.
- Author
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Dai H, You S, Ye H, Zhu T, Zhu ZK, and Luo J
- Abstract
2D organic-inorganic hybrid perovskites (OIHPs) have shown great promise in direct X-ray detection. The development of high-performance passive X-ray detectors in 2D OIHPs calls for an increase in material density while maintaining structural polarity, which is becoming quite challenging. Here, a high-density, polar 2D alternating-cation-intercalated (ACI) perovskite, (4-AP)Cs
2 Pb2 I8 ( B , 4-AP = 4-amidinopyridinium), capable of addressing this problem is successfully constructed by introducing heavy Cs+ into the interlayer space of an aromatic Dion-Jacobson (DJ) perovskite (4-AP)PbI4 ( A ). Through such a DJ-to-ACI design, the newly developed 2D OIHP B not only significantly increases its density to 4.23 g cm-3 (even higher than that of 3D MAPbI3 ) but also crystallizes in a polar space group ( Ama 2), which further leads to enhanced X-ray attenuation and an obvious polar photovoltage (1.1 V) under X-ray irradiation. As a result, X-ray detectors fabricated by high-quality single crystals of B exhibit excellent and stable detection performance under self-powered mode with a high sensitivity of 107 μC Gy-1 cm-2 and a low detection limit of 289 nGy s-1 . This work provides implications for the future exploration and regulation of novel ACI OIHPs for high-performance photoelectronic devices.- Published
- 2024
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